Choose gutter outlets according to published flow rate capacities.
Sizing gutters uk.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
According to this old house while 5 inch k style gutters and 6 inch half rounds are usually suitable for homes houses with big steep roofs or those located.
Gutter fixed level gutter fixed at 1 350 flow capacity.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
Gutters come in different sizes.
5 inch 5 520 square feet.
For accurate project specific advice on rainwater flow calculations contact our friendly knowledgeable team on 0800 644 44 26.
However if our effective roof area were 50 m 2 then we would not be able to use a level half round gutter with a stop end outlet ie the downpipe at one end of the gutter rather than in the middle.
All gutter systems in the uk should be designed to.
Downspouts should be constructed with conductor heads every 40 ft 12 2 m to admit air and prevent vacuum.
Offset of more than 10 ft 3 0 m can affect drainage capacity.
As you can see with an effective area of 40m 2 there will be no issue using any of these systems and configurations.
That s the figure you need to be working with or else you risk a guttering problem.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
Then use the information below to see what size gutter you need.
The size of the downspout should be constant through out its length.
5 inch 5 520 square feet.
The gutter outlet capacity should suit the downspout capacity.
Gutters come in different sizes.
Gutter flow litres sec roof area m gutter flow litres sec roof area m downpipe at centre half round 76mm 0 7 34 0 8 38 112mm 1 8 86 2 6 125 squareflo 3 2 154 3 8 182 125 68mm downpipe 3 8 182 4 6 221 82mm downpipe 4 0 191 4 9 235 regency 4 2 202 4 7 226 highflo 5 4 258 6 0 289.
Downspouts also come in different sizes such as 2 3 inches and 3 4 inches in size.
Simplifying the science size guide it is important that the sizes of gutters and pipes used in a rainwater system are selected with consideration of the size of the roof and the position of downpipes in order to ensure that typical rainfall does not cause the system to overflow.
Depending on building type a safety factor should be allowed for the sizing of internal gutters.
Now finally you can find the appropriate gutter size by looking at the following figures showing the relationship between different gutter systems and the roof area they ll be able to drain.
Lg 10 133 therefore reduction factor 0 86 d 0 1 gutter capacity x reduction factor 2 84 x 0 86 2 44 l s therefore the proposed system is suitable.
Then use the chart below to see what size gutter you need.
Floplast guide to guttering and roof area.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
Picking your gutter size.
5 inch 5 520 square feet.
